feat(www): landing page (#25)

* design: landing page spec + app icon asset

* chore(www): add anime.js, fonts, and landing page screenshot assets

* feat(www): add design tokens, fonts, shared layout

* feat(www): add landing page sections and styling

* feat(www): add theme toggle and anime.js viewport animations

* feat(www): feedback updates — no hero card, os-aware download, footer email, lowercase colored heading

* feat(www): remove screenshot borders, move macos hint below ctas, mobile github fallback

* feat(www): keep hero CTAs side by side

* feat(www): set initial nav border to transparent

* feat(www): add Rybbit prod-only, sitemap, SEO head, OG image, robots.txt, 404 page

* docs(AGENTS): include www landing page version in release sync checklist

* chore(www): add railpack.json for Dokploy deploy (force node provider, TZ)

* chore(www): use bun for Railpack deploy (packageManager + standalone www/bun.lock)

* docs(AGENTS): note www/bun.lock sync for Railpack deploys

* chore(www): add vitest test tooling

* feat(www): add FAQ data source

* feat(www): add SEO JSON-LD builders

* feat(www): add Seo JSON-LD component

* feat(www): wire Seo component and social/meta tags into Layout

* feat(www): add homepage JSON-LD, keyword H1, data-driven FAQ

* fix(www): point Roadmap footer link to GitHub

* feat(www): add lastmod to sitemap

* perf(www): self-host anime.js

* refactor(www): move nav and footer into shared Layout

* feat(www): add changelog page

* fix(www): make shared component styles global in Layout

* perf(www): optimize screenshots with Astro Image (webp/avif + srcset)

* feat(www): add web app manifest

* feat(www): add helpful links to 404 page

* fix(www): shorten homepage H1 copy

* fix(www): OS-aware navbar download + footer layout

* feat(www): build full changelog from v0.7.0 to v0.7.10

www/src/components/Seo.astro

@@ -0,0 +1,15 @@
+---
+import type { JsonLd } from "../lib/seo";
+
+interface Props {
+  jsonLd?: JsonLd[];
+}
+
+const { jsonLd = [] } = Astro.props;
+---
+
+{
+  jsonLd.map((ld) => (
+    <script type="application/ld+json" set:html={JSON.stringify(ld)} />
+  ))
+}